Crucible-furnace.



No. 664,248. Patented Dec. |8.'l900.

G. W. EMMERSDN & J. WARD.

.CRUCIBLE FURNACE.

(Application led Aug. 30, 1900.)

(No Model.)

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UNITED y STATES lPATENT OFFICE.

GEORGE WILLIAM EMMERSON AND JAMES WARD, OF NEWCASTLE-UPON- TYNE, ENGLAND.

CRUCIBLE-FURNACE.

SPECIFIGATION forming part of Letters Patent N0. 664,248, dated December 18, 1900. Appnmionneamguaso,1900. serrano. 28,531. cromati.)

To all whom, it may concern:

Be it known that we, GEORGE WILLIAM EMMERSON and JAMES WARD, subjects of the Queen of Great Britain, residing at Erick street, NeWcastle-upon-Tyne, England, have invented certain new and useful Improvements in Crucible-Furnaces, of which the following is a specification.

This invention relates to an improved crucible-furnace especially adapted for the manufacture of calcium carbid or the like or for melting steel, brass, or other metals or alloys.

In the accompanying drawings, Figure .l

is an elevation of a furnace constructed accordingto this invention. Fig. 2 is a sectional elevation thereof, and-Fig. 3 a sectional plan. Fig. 4 is a vertical section through the heating or regenerating chamber, and Fig. 5 is a section of a tray `for containing fuel.

The furnace consists of a series of chambers arranged, preferably, adjacent to each other, and the fuel used is crude petroleum, parafiin, or other suitable oil; but refined oils may also be used. The first chamber A is the vap- Orizing-chamber, the next, B, the gas heating or regenerating chamber. In the next or third chamber C the heated gas is mixed with heated air and plays on the pot or pots which are placed on the bottom of this chamber on suitable rests Z, this chamber being therefore Vthe first melting-chamber, passing thence in order to succeeding melting-chambersD E, of

which there may be two or more, and thence into the main fine F or chimney-stack G. F is a damper in said flue F. The chambers may be lined with any suitable refractory ma-A terial and have arched or fiat roofs and side Walls with hollow passages H. These passages may be checkered with bricks, dac., to give more heating-surface. tained in one or more shallow troughs or trays P, arranged above each other and preferably projecting a short distance outside the furnace. The trays are suitably supported-for instance, by angle-irons R. .The oil tank or reservoir V is preferably placed in some warm position-say by the side of the chimneystack or on the top of the flue or furnaceand a pipe W, provided with a regulating Valve or cock X, conveys the oil to the trays, the supply-pipe to each tray being also pro- The oil is convided with a regulating valve or cock Y. Sliding plates or dampers Q may be provided on the tops of the trays to regulate the vaporization of the oil contained therein. A slide or door S in the wall of the gas-heating chamber B admits the air into hollow J of said wall, which is checkered, which air after making the circuit of the melting-chambers and over the top of the gas-heating chamber is admitted by a flue or port K to the first meltingchamber 'C and mixes with the heated gas, which enters the said first melting-chamber by a iiue or port M immediately below. The gas or vaporized oil is conveyed from the vaporizing-chamber by a flue or port L into the bottom of the heating-cha mber, the latter owing its increased heat to its proximity tothe rst melting-chamber, from which it is only separated by a thin wall. The Walls between the melting-chambers are also comparatively thin. The gas passes by the port or Hue M from the upper part of chamber B to the upper part of 'chamber C and mixes with the heated air entering at K. The mixed gas and air then pass down the first melting-chamber C and through a port or flue N into the bottom of the second melting-chamber D and out by the top of this at N into the next one E, and so on, preferably leaving the last melting-chamber by the bottom, as at N2, to the flue F and stack G. Scot or other residuum accumulates in the vaporizing-chamber A, and means may be provided for its easy removal. The pots are placed in the meltingchambers C D E through openings O, provided with covers, as in ordinary cruciblefurnaces.

S is an aperture for admitting atmospheric air to passages H within the thickness of the walls of the furnace, and T is a valve operated by lever U for controlling supply of air The trays P are carried on supports R either permanently fixed to the brickwork or made in the form of a framing, so that the IOO whole can be withdrawn from the furnace and the open end of the furnace can then be temporarily built up or otherwise closed in order to retain the heat in the furnace.

We claim as our inventionl. In a Crucible-furnace the combination with a series of connected chambers adapted to inclose crucibles, of an antecedent gasheating chamber having a gas-passage to the first Crucible-chamber at its upper end, and a vaporizing-chamber having a passage to the heating-chamber at its lower end, vaporizers in said vaporizing-chamber, and regenerative air-passages passing about the heated parts of said furnace and having an outlet to the first crucible-chamber in proximity to the gas-passage thereto.

2. In a Crucible-furnace the combination with a series of connected chambers adapted to inclose crucibles, of an antecedent gasheating chamber having a gas-passage to the first crucible-chamber at its upper end and a vaporizing-chamber having a passage to the heating-chamber at its lower end, vaporizers in said vaporizing-chamber and regenerative air-passages passing about lthe heated parts of said furnace and between the vaporizing and heating chambers and having an outlet to the first Crucible-chamber in proximity to the gas-passage thereto.

3. In a Crucible-furnace the combination with a series of connected chambers adapted to inclose crucibles, of an antecedent gasheating chamber having a gas-passage to the first Crucible-chamber at its upper end and a vaporizing-chamber having a passage to the heating-chamber at its lower end, vaporizers in said vaporizing-chamber and regenerative air-passages passing about the heated parts of said furnace between the vaporizing and heating chambers and above the heatingchamber and having an outlet to the first Crucible-chamber in proximity to the gaspassage thereto.

4. In a Crucible-furnace the combination with a series of chambers adapted to inclose crucibles and having an opening each to the next alternately in the upper and in the lower part thereof respectively, of an antecedent gas-heating chamber alined therewith, having a gas-passage to the first Crucible-chamber at its upper end, and a vaporizing-chamber alined with the heating-chamber having a passage to the heating-chamberatits lower end, with vaporizers in said Vaporizing-chamber and regenerative air-passages passing about the heated parts of said furnace and having an outlet to the first crucible-chalnber in proximity to the gas-passage thereto.

In witness whereof we have signed this specification in the presence of two witnesses.

GEORGE WILLIAM EMMERSON. JAMES WARD. Witnesses:

WILLIAM DAGGETT, GEORGE GREY. 

